Technical datasheet

Crastin® SK609 BK851

Supplied byCelanese- Last Updated on May 19, 2026

Crastin® SK609 BK851 by Celanese is a lubricated polybutylene terephthalate (PBT) resin reinforced with 50% glass fiber. Possesses mechanical and physical properties such as stiffness & toughness, heat-, friction-, chemical-, heat ageing- & wear resistance, excellent surface finishes and good colorability. Exhibits good melt stability and excellent electrical insulation characteristics. Good melt stability enables the recycling of properly handled production waste. Crastin® SK609 BK851 is suitable for processing by injection molding. Applications include electronics, electrical, automotive, mechanical engineering, chemical, domestic appliances and sporting goods industry.
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Crastin® SK609 BK851 properties

Electrical properties

PropertiesValue & unitTest conditionTest method
Comparative Tracking Index (CTI)0.0 Visible After LoginVisible After LoginVisible After Login

Flammability properties

PropertiesValue & unitTest conditionTest method
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Glow Wire Flammability Index (GWFI)0.0 Visible After LoginVisible After LoginVisible After Login

Mechanical properties

PropertiesValue & unitTest conditionTest method
Elongation at Break0.0 Visible After LoginVisible After LoginVisible After Login
Flexural Strength0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Notched Charpy0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Notched Izod0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Unnotched Charpy0.0 Visible After LoginVisible After LoginVisible After Login
Modulus of Elasticity0.0 Visible After LoginVisible After LoginVisible After Login
Tensile Strength at Break0.0 Visible After LoginVisible After LoginVisible After Login

Physical properties

PropertiesValue & unitTest conditionTest method
Density0.0 Visible After LoginVisible After LoginVisible After Login

Thermal properties

PropertiesValue & unitTest conditionTest method
Heat Deflection Temperature (HDT), Unannealed0.0 Visible After LoginVisible After LoginVisible After Login
Melting Point0.0 Visible After LoginVisible After LoginVisible After Login
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UL RTI, Mechanical with Impact0.0 Visible After LoginVisible After LoginVisible After Login
UL RTI, Mechanical without Impact0.0 Visible After LoginVisible After LoginVisible After Login

Crastin® SK609 BK851 Processing Guidelines

Injection Molding Processing Guidelines

PropertiesValue & unitTest conditionTest method
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